Barbara Demick, the L.A. Times’s excellent correspondent covering North Korea, has written a book about the people that most big media correspondents have dedicated their careers to ignoring. Yet every town in North Korea, no matter how small, has a movie theater, thanks to Kim Jong Il’s conviction that film is an indispensable tool for instilling loyalty in the masses. When Mi-ran was growing up, Hollywood films were banned from North Korea, as were virtually all other foreign films, with...